Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
  • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
  • G03F7/004—Photosensitive materials
  • G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable

Definitions

• CPMB cellulose propionate 3-morpholinobutyrates
• CPMBs that are useful in the practice of this invention are those that are readily soluble in common organic solvents such as acetone and ethyl alcohol, and which contain from about 20 to about 50 weight percent of morpholinobutyrate, from about 10 to about 33 weight percent propionyl and from about to about 5.5 weight percent of hydroxyl.
• CPMB can be manufactured by conventional procedures involving (a) the preparation of cellulose propionate crotonate, (b) partial hydrolysis of this material if desired, and (c) thereafter reaction with morpholine, preferably in the presence of an acidic catalyst such as, for example, acetic acid (as described in U.S. Pat. application Ser. No. 653,645, filed July 17, 1967).
• the CPMB be stabilized (against spontaneous degradation to which it is subject under certain conditions) by the incorporation (i.e., fairly uniform blending) thereinto of a small amount (for example, from about 0.05 to about weight percent, based on the weight of CPMB) of an organic antioxidant such as butylated hydroxytoluene p-tertiary butylphenol, tertiary butyl hydroquinone, p-methoxyphenol and the like, in accordance with the teachings appearing in U.S. Pat. application Ser. No. 653,646, filed July 17, 1967.
• an organic antioxidant such as butylated hydroxytoluene p-tertiary butylphenol, tertiary butyl hydroquinone, p-methoxyphenol and the like
• sensitizers that can be used effectively in conjunction with CPMB in the radiationsensitive compositions of the present invention are all of those disclosed in U.S. Pat. No. 2,610,120, and 2-methylanthraquinone.
• EXAMPLE 1 Cellulose propionate 3-morpholinobutyrate (CPMB) of 3.85 percent nitrogen (42.9 percent morpholinobutyryl) content, and containing 1 percent of butylated hydroxytoluene as a stabilizer is dissolved to make a 5 percent solution in methyl ethyl ketone and 5 percent (based on polymer weight) of 2- methylanthraquinone is added as a sensitizer. Some of this solution is poured onto a precleaned 4X6 inch piece of aluminum and flowed over the surface. The metal is then placed in a dark box where the excess solution is allowed to drain off one end of the plate.
• CPMB Cellulose propionate 3-morpholinobutyrate
• the plate is held at room temperature in the dark for 1 hour, then removed from the box and placed in contact with a test negative on Kodalith film.
• the aluminum plate and negative are sandwiched between A-inch glass plates and exposed to a General Electric type S-l 300-watt mercury vapor light at a distance of 5% inches for 8 minutes. Some of the heat from the lamp is dissipated by blowing air over the glass during the exposure.
• the aluminum plate After exposure, the aluminum plate is removed from the glass carrier and the coated side developed by washing the surface for 1 minute with methyl ethyl ketone. At this time essentially all of the unexposed polymer coating is removed. The image formed by the insoluble polymer is clearly visible. After allowing the plate to dry in a 1 10 C. oven for 3 minutes and cooling to room temperature a rub-up ink is applied in a desensitizing etch solution.
• the inked polymer image on the plate is found to be sharp and distinct and can be rubbed vigorously without noticeable deterioration of the image.
• EXAMPLE 2 A small amount of the polymer solution from Example 1 is coated on glass, copper, stainless steel and paper. Exposures are made through a halftone negative and satisfactory well defined images are obtained on all materials tested when developed with methyl ethyl ketone. Images of the polymer material are resistant to acetone, methyl ethyl ketone, water and alcohols, but are swollen by dilute acids such as acetic, which cause the polymer to lose adhesion for the substrate and float off intact.
• EXAMPLE 3 A small square of black anodized aluminum is coated with the polymer solution from Example 1 then cured in the dark at room temperature for 1 hour. This coated surface is placed in contact with a halftone negative and exposed under glass as in Example 1. After exposure the polymer is developed by spraying methyl ethyl ketone over the surface using a small spray powered with an aerosol propellant. After development and drying the image is visible on the aluminum. This is then treated by slowly pouring 10 percent potassium hydroxide over the surface five times. The black surface of the metal is dissolved and removed from areas where the polymer has been removed during development, but the black areas under the insolubilized polymer coating are not affected by the alkali treatment. A positive print on anodized aluminum is thus obtained from the halftone negative.
• EXAMPLE 4 Small samples of a lithographic plate are coated with the polymer solution from Example I and cured in the dark. These samples, one at a time, are placed in contact with a sheet of paper containing printed letters in black, then are placed paper down on a hot plate at 300 F. These are heated for various times until an image can be developed by washing the aluminum with acetone. An image is obtained when the piece is heated for 1.5 minutes, although some of the polymeric coatings form a tan color during heating. The image obtained is dark in the same areas which are dark on the paper original.
• organic solvent or mixture of organic solvents
• preferred photochemical resist compositions of this invention comprise the resulting coated article having at least one layer thereon which consists essentially of one or more of the CPMBs described above and at least one radiation sensitizer (to enhance the sensitivity of the CPMB to actinic-radiation when it is exposed).
• a photochemical resist element comprising a solid substrate having a radiation-sensitive coating thereon; said coating consisting essentially of stabilized cellulose propionate 3- morpholinobutyrate and at least one organic photolytic sensitizer to enhance the sensitivity of said cellulose propionate 3- morpholinobutyrate to actinic radiation.

Landscapes

• Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• General Physics & Mathematics (AREA)
• Photosensitive Polymer And Photoresist Processing (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=25145140

Family Applications (1)

Country Status (6)

Cited By (2)

Citations (1)

• 1969
  • 1969-01-02 US US788650A patent/US3645744A/en not_active Expired - Lifetime
  • 1969-12-04 CA CA069022A patent/CA921752A/en not_active Expired
  • 1969-12-11 DE DE19691962230 patent/DE1962230A1/de active Pending
  • 1969-12-29 BE BE743811D patent/BE743811A/xx unknown
  • 1969-12-29 FR FR6945170A patent/FR2027643A1/fr not_active Withdrawn
• 1970
  • 1970-01-02 GB GB070/70A patent/GB1273122A/en not_active Expired

Patent Citations (1)

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